holaspis

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holaspis (plural holaspides)

1. (paleontology, zoology) A stage in the development of a trilobite at which the creature has gained its adult segmentation, but continues to molt and grow.
   • 2001, Jonathan M. Adrain, Gregory D. Edgecombe, Bruce S. Lieberman, editors, Fossils, Phylogeny, and Form: An Analytical Approach, page 46:

     A similar situation may also characterize S. wenlockiana, a species with six segments in holaspis, the smallest holaspids of which have similar glabellar lengths to those of the sixth degree meraspis of A. konincki.

   • 2008, Xuejian Zhu, Shanchi Peng, Jingxun Zuo, “Revision an Ventral Structure of Guangxiaspis guangxiensis Zhou, 1977 (Trilobita)”, in Isabel Rábano, Rodolfo Gozalo, Diego García-Bellido Capdevila, editors, Advances in Trilobite Research, page 444:

     The pygidial spines are stout and direct outward in the early holaspis (Fig. 2, A-B, F), but become slender and direct inward in the late holaspis (Fig. 2, D, E).

   • 2009, Michael J. Benton, David A. T. Harper, Introduction to Paleobiology and the Fossil Record, page 366:

     The holaspis stage has a full complement of thoracic segments for the species but growth continues through further molts and maturity may not be reached until some time after the holaspis stage was reached.

• holaspid

• meraspis
• protaspis

• 2007, S. M. Gon III, "Trilobite Reproduction and Development"

• haplosis